An antenna for a mobile phone and a mobile phone having the same are provided. The antenna for a mobile phone includes: a metal mobile phone case provided with a first slot and a second slot intersecting with the first slot; a circuit board having a clearance zone and a parasitic branch stretching into the clearance zone, and disposed within the metal mobile phone case; an exciting sheet disposed between the circuit board and the metal mobile phone case, and across the first slot in a width direction of the first slot; a dielectric filler disposed between the exciting sheet and the metal mobile phone case, and configured to fill the first slot and the second slot.